Every human's greatest fear is that we are not enough and as a result that we won't be loved. We are born this way. It is human psychology 101. Without love a human baby dies. Other animals won't. So this is not some artificial construct that develops over time--it is hardwired into us at our most fundamental level, via our autonomic nervous system.
This swapping back and forth between the horrific and the mundane or even jolly, is not uncharacteristic of common ways of ways coping with chronic trauma: the black humour of a doctors' mess, for example. Humour is known to be an effective coping strategy, associated with a lower risk of post traumatic stress disorder.
What you wear affects you psychologically. It can profoundly alter your mood. It also influences how others respond to you. And the visual illusion created by cut and fabric dramatically changes the appearance of your body. Your clothes can affect your job prospects, your love life and even your self-image.